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Process for preparing high-performance composite concrete from mineral powder, machine-made sand and waste concrete
The invention discloses a process for preparing high-performance composite concrete from mineral powder, machine-made sand and waste concrete. The preparation process comprises the following steps: S1, adding half of water into nanometer silicon dioxide, and carrying out ultrasonic dispersion; S2, adding the rest of water into the cement, and carrying out stirring and mixing for 1 to 3 minutes under the condition of a speed of 300 to 500 r/min; S3, adding coarse aggregate, fine aggregate, mineral powder and machine-made sand into cement paste obtained in the S2, and carrying out stirring and mixing for 3-5 min under the condition of a speed of 300-500 r/min; and S4, adding silica fume, fly ash, a naphthalene water reducer and a mixed solution having the nanometer silicon dioxide uniformlydispersed therein and obtained in the S1 into the cement paste stirred and mixed in the S3, and continuing stirring for 5-15 minutes under the condition of a speed of 500-800 r/min to obtain the high-performance composite concrete. The concrete prepared by the invention has good rheological property and compressive property.
本发明公开了矿粉、机制砂和废弃混凝土制备高性能复合混凝土工艺，其制备的方法步骤如下：S1：在纳米二氧化硅中加入一半的水并超声分散；S2：在水泥中加入余下的水，并在300‑500r/min条件下搅拌混合1‑3min；S3：在S2中的水泥浆中加入粗骨料、细骨料、矿粉和机制砂，并在300‑500r/min条件下搅拌混合3‑5min；S4：将硅灰、粉煤灰、萘系减水剂和S1中均匀分散有纳米二氧化硅的混合液加入S3搅拌混合后的浆料中，并在500‑800r/min条件下继续搅拌5‑15min，制得高性能复合混凝土。本发明制备的混凝土具有良好的流变性能和抗压性能。
Process for preparing high-performance composite concrete from mineral powder, machine-made sand and waste concrete
The invention discloses a process for preparing high-performance composite concrete from mineral powder, machine-made sand and waste concrete. The preparation process comprises the following steps: S1, adding half of water into nanometer silicon dioxide, and carrying out ultrasonic dispersion; S2, adding the rest of water into the cement, and carrying out stirring and mixing for 1 to 3 minutes under the condition of a speed of 300 to 500 r/min; S3, adding coarse aggregate, fine aggregate, mineral powder and machine-made sand into cement paste obtained in the S2, and carrying out stirring and mixing for 3-5 min under the condition of a speed of 300-500 r/min; and S4, adding silica fume, fly ash, a naphthalene water reducer and a mixed solution having the nanometer silicon dioxide uniformlydispersed therein and obtained in the S1 into the cement paste stirred and mixed in the S3, and continuing stirring for 5-15 minutes under the condition of a speed of 500-800 r/min to obtain the high-performance composite concrete. The concrete prepared by the invention has good rheological property and compressive property.
本发明公开了矿粉、机制砂和废弃混凝土制备高性能复合混凝土工艺，其制备的方法步骤如下：S1：在纳米二氧化硅中加入一半的水并超声分散；S2：在水泥中加入余下的水，并在300‑500r/min条件下搅拌混合1‑3min；S3：在S2中的水泥浆中加入粗骨料、细骨料、矿粉和机制砂，并在300‑500r/min条件下搅拌混合3‑5min；S4：将硅灰、粉煤灰、萘系减水剂和S1中均匀分散有纳米二氧化硅的混合液加入S3搅拌混合后的浆料中，并在500‑800r/min条件下继续搅拌5‑15min，制得高性能复合混凝土。本发明制备的混凝土具有良好的流变性能和抗压性能。
Process for preparing high-performance composite concrete from mineral powder, machine-made sand and waste concrete
矿粉、机制砂和废弃混凝土制备高性能复合混凝土工艺
LI GUOHONG (author) / JIA CUIYING (author) / LIU CHAO (author) / LI PEI (author) / YE TING (author) / LUO JUN (author) / ZHANG DEXIN (author) / CHEN YUANLONG (author)
2020-07-17
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
Preparation process for preparing concrete from machine-made sand and industrial waste residues
| European Patent Office | 2024